Which of the following functions is performed by the kidney in a frog?

In frogs,where is the $Bidder's$ canal found?

The number of spinal nerves in a frog is ..........

Identify $P, Q$ and $R$ in the given figure.

Choose the correct sentences for a female frog.
$1$. Vocal sacs are absent in female frogs.
$2$. $A$ mature female can lay $2500$ to $3000$ ova at a time.
$3$. In female frogs,fertilized eggs are encased in oothecae and it is a dark reddish to blackish brown.

$A$: In frogs,the skin acts as a respiratory organ.
$R$: The skin of a frog is moist,slimy,and lacks an exoskeleton.